A well-written riddle.

来源: 于 2014-08-24 14:53:03 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

It is a well-written riddle. Unfortunately, I could not figure it out. I will wait for your answer to the riddle.

By the way, how are you doing? Are you still busy with your online classes?